Sword Art Online and Girls und Panzer.  That would go pretty dark, pretty quick.
I also thought about SAO and The Gamer, but the latter is already almost an inversion of the former -- where the real world begins to behave by game-world rules.
	
	
	
I also thought about SAO and The Gamer, but the latter is already almost an inversion of the former -- where the real world begins to behave by game-world rules.

 
 

 
